package com.pumpkin.esapi.service;

import com.alibaba.fastjson.JSON;
import com.pumpkin.esapi.pojo.Content;
import com.pumpkin.esapi.utils.HttpParseUtil;
import com.sun.org.apache.xpath.internal.operations.Bool;
import org.elasticsearch.action.bulk.BulkRequest;
import org.elasticsearch.action.bulk.BulkResponse;
import org.elasticsearch.action.index.IndexRequest;
import org.elasticsearch.action.search.SearchRequest;
import org.elasticsearch.action.search.SearchResponse;
import org.elasticsearch.client.RequestOptions;
import org.elasticsearch.client.RestHighLevelClient;
import org.elasticsearch.common.text.Text;
import org.elasticsearch.common.unit.TimeValue;
import org.elasticsearch.common.xcontent.XContentType;
import org.elasticsearch.index.query.QueryBuilders;
import org.elasticsearch.index.query.TermQueryBuilder;
import org.elasticsearch.search.SearchHit;
import org.elasticsearch.search.builder.SearchSourceBuilder;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightBuilder;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightField;
import org.springframework.stereotype.Service;

import javax.annotation.Resource;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.Objects;
import java.util.concurrent.TimeUnit;

@Service
public class ContentService {

    @Resource
    private RestHighLevelClient restHighLevelClient;

    @Resource
    private HttpParseUtil httpParseUtil;

    /**
     * 解析数据放入es的索引中
     * @param keywords
     * @return
     * @throws IOException
     */
    public Boolean parseContent(String keywords) throws IOException {
        List<Content> contentList = httpParseUtil.parseJD(keywords);
        //把查询到的数据放入es索引中
        BulkRequest bulkRequest = new BulkRequest();
        bulkRequest.timeout("2m");
        for (int i = 0; i < contentList.size(); i++) {
            bulkRequest.add(new IndexRequest("jd_goods").source(JSON.toJSONString(contentList.get(i)), XContentType.JSON));
        }
        BulkResponse bulkResponse = restHighLevelClient.bulk(bulkRequest, RequestOptions.DEFAULT);
        return !bulkResponse.hasFailures();
    }

    /**
     * 根据关键字进行分页搜索
     * @param keyword
     * @param pageNo
     * @param pageSize
     * @return
     * @throws IOException
     */
    public List<Map<String, Object>> searchPage(String keyword,int pageNo,int pageSize) throws IOException {
        if (pageNo <= 1) {
            pageNo = 1;
        }
        //条件搜索
        SearchRequest searchRequest = new SearchRequest("jd_goods");
        SearchSourceBuilder sourceBuilder = new SearchSourceBuilder();
        //分页
        sourceBuilder.from(pageNo);
        sourceBuilder.size(pageSize);
        //精准匹配
        TermQueryBuilder termQueryBuilder = QueryBuilders.termQuery("title", keyword);
        sourceBuilder.query(termQueryBuilder);
        sourceBuilder.timeout(new TimeValue(60, TimeUnit.SECONDS));
        //执行搜索
        searchRequest.source(sourceBuilder);
        SearchResponse searchResponse = restHighLevelClient.search(searchRequest, RequestOptions.DEFAULT);
        //解析结果
        List<Map<String,Object>> list = new ArrayList<>();
        for (SearchHit documentFields : searchResponse.getHits().getHits()) {
            list.add(documentFields.getSourceAsMap());
        }
        return list;
    }

    /**
     * 高亮搜索
     * @param keyword
     * @param pageNo
     * @param pageSize
     * @return
     * @throws IOException
     */
    public List<Map<String, Object>> searchHighlight(String keyword,int pageNo,int pageSize) throws IOException {
        if (pageNo <= 1) {
            pageNo = 1;
        }
        //条件搜索
        SearchRequest searchRequest = new SearchRequest("jd_goods");
        SearchSourceBuilder sourceBuilder = new SearchSourceBuilder();
        //分页
        sourceBuilder.from(pageNo);
        sourceBuilder.size(pageSize);
        //精准匹配
        TermQueryBuilder termQueryBuilder = QueryBuilders.termQuery("title", keyword);
        sourceBuilder.query(termQueryBuilder);
        sourceBuilder.timeout(new TimeValue(60, TimeUnit.SECONDS));

        //高亮显示
        HighlightBuilder highlightBuilder = new HighlightBuilder();
        //多个高亮只显示一个
        highlightBuilder.requireFieldMatch(false);
        highlightBuilder.field("title");
        highlightBuilder.preTags("<span style='color: red'>");
        highlightBuilder.postTags("</span>");
        sourceBuilder.highlighter(highlightBuilder);

        //执行搜索
        searchRequest.source(sourceBuilder);
        SearchResponse searchResponse = restHighLevelClient.search(searchRequest, RequestOptions.DEFAULT);
        //解析结果
        List<Map<String,Object>> list = new ArrayList<>();
        for (SearchHit hit : searchResponse.getHits().getHits()) {
            Map<String, HighlightField> highlightFields = hit.getHighlightFields();
            HighlightField title = highlightFields.get("title");
            System.out.println("title:" + title);
            Map<String, Object> sourceAsMap = hit.getSourceAsMap();
            //解析高亮字段，将原来的字段替换为高亮的字段，title不为空就是搜索到了存在高亮的关键字
            if (title != null) {
                Text[] fragments = title.fragments();
                StringBuilder n_title = new StringBuilder();
                for (Text text : fragments) {
                    System.out.println("text:" + text);
                    n_title.append(text);
                }
                //将高亮字段替换
                sourceAsMap.put("title", n_title.toString());
            }
            list.add(sourceAsMap);
        }
        return list;
    }
}
